1321120320221 has 48 divisors (see below), whose sum is σ = 1523121801600. Its totient is φ = 1138860518400.

The previous prime is 1321120320193. The next prime is 1321120320241. The reversal of 1321120320221 is 1220230211231.

It is a de Polignac number, because none of the positive numbers 2^k-1321120320221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1321120320193 and 1321120320202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321120320241) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 296812046 + ... + 296816496.

It is an arithmetic number, because the mean of its divisors is an integer number (31731704200).

Almost surely, 2^{1321120320221} is an apocalyptic number.

It is an amenable number.

1321120320221 is a deficient number, since it is larger than the sum of its proper divisors (202001481379).

1321120320221 is a wasteful number, since it uses less digits than its factorization.

1321120320221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5094 (or 5077 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 1321120320221 its reverse (1220230211231), we get a palindrome (2541350531452).

The spelling of 1321120320221 in words is "one trillion, three hundred twenty-one billion, one hundred twenty million, three hundred twenty thousand, two hundred twenty-one".